Today's Message Index:
----------------------
1. 03:33 PM - Low power @ full throttle (jpkarnes@comcast.net)
2. 05:45 PM - Re: Low power @ full throttle (ron hansen)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Low power @ full throttle |
Hi all,
=C2-
I must convince that I'm at a loss to figure out why I can't reach full RPM
's @ full throttle.=C2- It was running fine until I performed several upg
rades including:
=C2-
1.=C2- Switched the .25" rubber fuel hose to 3/8" aluminum tubing.
2.=C2- Heads retooled by Ram.
3.=C2- Carbs overhauled.
=C2-
It seems to run fine until about 3K RPM and then "surges" up and down a bit
.=C2- Any more throttle than that and it runs crappy.=C2- The timing is
@ 32 deg @ 4000 RPM (with no prop on).=C2- Any ideas?
=C2-
John K.
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Low power @ full throttle |
John,
I don't think any of your changes should cause that problem directly. You
will probably be lean and hot with the Ram head work and need to go to
larger jets, but I don't think that would cause surging or roughness. It
didn't with me, but I did have to go to larger jets for cooling. Ron at
Ram dynoed my engine and he used 30 degrees BTDC at 4500 RPM and got just
over 100HP. I don't know if that's significantly different than your
timing or not.
I had troubles with mogas (w/ alcohol) getting old and cruddy in a matter
of weeks here in California until I switched to avgas. If all this work
took a while your gas might have degraded and also your fuel line work
might have left some particles in the lines no matter how careful. (Done
that.) Some of the air passages in the carbs are no bigger than a
toothbrush bristle so it doesn't take much to clog them.
If you have EGTs you can see if both banks are the same. I added EGTs to
sort out carb and cooling issues and continue to be glad I have them.
Good luck,
Ron Hansen
601HDS, Stratus/Ram Subaru
On Tue, May 19, 2015 at 3:33 PM, <jpkarnes@comcast.net> wrote:
> Hi all,
>
> I must convince that I'm at a loss to figure out why I can't reach full
> RPM's @ full throttle. It was running fine until I performed several
> upgrades including:
>
> 1. Switched the .25" rubber fuel hose to 3/8" aluminum tubing.
> 2. Heads retooled by Ram.
> 3. Carbs overhauled.
>
> It seems to run fine until about 3K RPM and then "surges" up and down a
> bit. Any more throttle than that and it runs crappy. The timing is @ 32
> deg @ 4000 RPM (with no prop on). Any ideas?
>
> John K.
>
> *
>
>
> *
>
>
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|